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arXiv · 1204.3964

Polarizabilities of Si^{2+}: a benchmark test of theory and experiment

M. S. Safronova·S. G. Porsev·M. G. Kozlov·Charles W. Clark
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Abstract

We have calculated electric-dipole polarizabilities of the 3s^2 ^1S_0, 3s3p ^3P_0, and 3s3p ^1P_1 states of the Si^{2+} ion using recently developed configuration interaction + all-order method. Detailed evaluation of the uncertainties of the final results is carried out. Our value for the ground state electric-dipole polarizability 11.670(13) a.u. is in excellent agreement with the resonant excitation Stark ionization spectroscopy value 11.669(9) a.u. [Komara et al., J. Phys. B 38, 87 (2005); Mitroy, Phys. Rev. A 78, 052515 (2008)]. This work represents the most precise benchmark test to date of theory and experiment in divalent atoms. The near cancellation of the ns^2 ^1S_0 ground state and the lowest nsnp ^3P_0 polarizabilities previously observed in B+, Al+, In+, Tl+, and Pb^{2+} is also found in Si^{2+} ion.

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M. S. Safronova, S. G. Porsev, M. G. Kozlov, Charles W. Clark. 2012-04-18. Polarizabilities of Si^{2+}: a benchmark test of theory and experiment. https://doi.org/10.1103/physreva.85.052506

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